Homework Help: Find peak voltage across capacitor

1. Jul 10, 2009

randomdude20

Hi everyone!

I hope you people can help me out at a problem I am stuck with:

1. The problem statement, all variables and given/known data

Find the peak voltage across the capacitor "C"

All variables given and an image of the circuit are:

• http://img36.imageshack.us/img36/580/photo2fsc.jpg [Broken]
• The circuit is connected to an AC battery of 25V labeled as "U" in the diagram.
• Lightbulbs "L1" and "L2" use 5.5 W each
• Lightbulbs "L3" and "L4" use 2 W each
• All bulbs will light up if they each receive 4.5V (thats exactly how the question states it)
• Resistance across point "A" and "B" is 5.4 Ohm

2. The attempt at a solution

To be honest - I don't even know where to start this problem. The only thing which I thought to do is to calculate the peak voltage of the battery. Which is 35.36V. The next step I thought to do is to calculate the voltage across the bulbs - however I don't have any current value.

Any breadcrumbs to get me started would be great.

Last edited by a moderator: May 4, 2017
2. Jul 10, 2009

darkSun

Do they give you the capacitance?